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You searched for: subject:"electronic structure"
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[texts]LCAO local density functional approach to surface electronic structure calculations - Mintmire, John Wallace, 1955-
Typescript
Keywords: Electronic structure; Thin films
Downloads: 127
[texts]Chemical Bonding and the Structure of Molecules - George E. Ryschkewitsch
George E. Ryschkewitsch Chemical Bonding and the Structure of Molecules Chapman & Hall Ltd. 1963 Acrobat 7 Pdf 14.2 Mb. Scanned by artmisa using Canon DR2580C + flatbed option
Keywords: Chemistry; Electronic Structure; Covalent; Ionic
Downloads: 258
[texts]High energy-density materials : the role of predictive theory - Wilson, Kenneth John,
http://uf.catalog.fcla.edu/uf.jsp?st=UF002824465&ix=pm&I=0&V=D&pm=1
Keywords: Chemistry, Physical and theoretical; Electronic structure
Downloads: 51
[texts]Enhancing Science Teacher Training Using Water Resources and GLOBE - Falco, James W
Heritage College, located on the Yakama Indian Reservation in south central Washington state, serves a multicultural, underserved, rural population and trains teachers to staff the disadvantaged school districts on and surrounding the reservation. In-service teachers and pre-service teachers in the area show strength in biology but have weak backgrounds in chemistry and mathematics. We are addressing this problem by providing a 2-year core of courses for 3 groups of 25 students (15 pre-service a...
Keywords: ELECTRONIC STRUCTURE; GROUND STATE; ZINC OXIDES; ELECTRON AFFINITY; VALENCE; SPECTROSCOPY
Downloads: 63
[texts]A study of the inductance of four-terminal resistance standards (Volume Bulletin of the Bureau of Standards, Vol. 13, 375-422 (1916) Scientific Paper 281 (S281))
A study of the various methods of measuring the time-constants of four-terminal resistance standards, which are classified into two main types, viz. (1) those in which the working material is formed into a /b closed/ circuit of as little self-inductance as possible, and the potential leads kept free from all inductive effects, and (2) those in which the potential leads are placed as close as possible to this working resistance so that the mutual inductance of the lead and the resistance is nearl...
Keywords: inductance; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 141
[texts]Additions to the formulas for the calculation of mutual and self-inductance (Volume Bulletin of the Bureau of Standards, Vol. 14, 537-570 (1919) Scientific Paper 320 (S320))
This paper is supplementary to previous papers on the subject published by the Bureau of Standards, and brings the list of formulae up to date. Butterworth's series formulae for the calculation of the mutual inductance of two parallel coaxial circles are compared with those given by others, and it is shown that they diminish the labour of computation. Butterworth's formulae for the mutual inductance of parallel eccentric circles are next considered, and various particular cases are given and num...
Keywords: inductance; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 130
[texts]Formulas and tables for the calculation of mutual and self-inductance (Revised) (Volume Bulletin of the Bureau of Standards, Vol. 8, 1-287 (1912) Scientific Paper 169 (S169))
This paper is an extension and revision of a previous paper by Rosa and Cohen. It is now by far the most complete and thorough study of the subject that has yet been published. The authors have taken great pains to bring it thoroughly up to date, and have made a critical study of nearly all the recent papers on the subject. The comparisons of the results obtained by various authors and the invcstigations of the convergence of the various series that have been proposed have cleared up the whole s...
Keywords: inductance; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 1,722
[texts]Various modifications of bismuth-silver thermopiles having a continuous absorbing surface (Volume Bulletin of the Bureau of Standards, Vol. 11, 131-187 (1914) Scientific Paper 229 (S229))
The linear thermopile consisting of Bi and Ag wires with rectangular receivers attached to the junctures of these two metals has all the advantages of a good bolometer with none of its disadvantages. Its novelty consists in a series of overlapping receivers forming a continuous surface. The object of the present paper is to illustrate various modifications and uses to which this instrument has been adapted and to indicate further applications...
Keywords: thermoelectricity; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 68
[texts]The self and mutual-inductance of linear conductors (Volume Bulletin of the Bureau of Standards, Vol. 4, 301-344 (1908) Scientific Paper 80 (S80))
Formulae for the self and mutual inductances of straight wires and rectangles are to be found in various books and papers, but their demonstrations are usually omitted, and approximate formulae are often given as though they were exact. The author derives the expressions very simply from Laplace's formula instead of using Neumann's formula, and thus gives a much better physical view of their meaning...
Keywords: inductance; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 285
[texts]The measurement of the inductances of resistance coils (Volume Bulletin of the Bureau of Standards, Vol. 8, 455-485 (1912) Scientific Paper 175 (S175))
In this paper is treated the measurement of the "effective inductance" of non-inductive resistance coils for use in alternating-current bridges and in potentiometer circuits where it is desired to know the phase-angle. The latter depends on the inductance and the capacities between the windings and between the various parts of the coil and the earth. The "effective inductance" is that value of inductance which would produce the observed phase-angle...
Keywords: inductance; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 151
[texts]Remote control in a laboratory (Volume Bulletin of the Bureau of Standards, Vol. 13, 581-597 (1917) Scientific Paper 291 (S291))
A description of the construction and mode of operation of a remote control system in the electrical laboratory of the Bureau of Standards. Electric motors are installed to move contact brushes on the various resistances to be controlled, the switches controlling the different motors being mounted on movable control panels that can be connected to the motor circuits at different points in the laboratory by means of jacks...
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 125
[texts]Note on electrical conduction in metals at low temperatures (Volume Bulletin of the Bureau of Standards, Vol. 14, 301-306 (1918) Scientific Paper 307 (S307))
The passage from electrical super-conductivity to normal conductivity of metals at low temperatures may be attained with a critical current density or by the application of a critical magnetic field. The author regards these two means as interdependent. In a previous paper the case of a wire conveying a current was treated and the magnetic field resulting was such as to give rise to a central superconducting core with an outer resisting layer...
Keywords: electrical conductivity; temperatures (high and low); Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 78
[texts]Implementation of the NASA Metacenter - Jones, James Patto
This paper discusses the efforts to create, using two NASA SP2 supercomputers, a 'Metacenter' which includes the capability to transparently and dynamically distribute the SP2 workload across the geographically separated systems. Functional components of the Phase 1 Metacenter are identified, outstanding issues are discussed, and the plan for the second phase of the project is outlined.
Keywords: HELIUM COMPOUNDS; ELECTRONIC STRUCTURE; METASTABLE STATE; HYDROGEN; FLUORINE; CHEMICAL BONDS; REACTION KINETICS
Downloads: 96
[texts]Mica condensers as standards of capacity (Volume Bulletin of the Bureau of Standards, Vol. 6, 431-488 (1910) Scientific Paper 137 (S137))
Various methods for measuring capacity, with alternating and direct current, and the advantages and disadvantages of each, are discussed. For this particular investiation the series inductance method was preferred, and was used almot exclusively. There is a wide variation in the temperature-coefficient of mica condensers, and in seeking the cause of this it was observed that of 2 condensers of similar capacity the one with the larger temperature-coefficient was the thicker...
Keywords: capacitance; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 138
[texts]Insulating properties of solid dielectrics (Volume Bulletin of the Bureau of Standards, Vol. 11, 359-420 (1915) Scientific Paper 234 (S234))
Methods of measuring very high resistances are discussed, diagrams being given showing how they may be applied to the measurement of volume resistivity and surface resistivity. The volume resistivities of more than 60 materials are tabulated. The effects of humidity of the air, temperature, and the magnitude and time of application of the impressed voltage, are discussed. The surface resistivity is shown to be due to a surface film, usually of water or oil, on the insulator...
Keywords: dielectric materials; insulation and insulators; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 228
[texts]REACH: Real-Time Data Awareness in Multi-Spacecraft Missions - Maks, Lori
NASA's Advanced Architectures and Automation Branch at the Goddard Space Flight Center (Code 588) saw the potential to reduce the cost of constellation missions by creating new user interfaces to the ground system health-and-safety data. The goal is to enable a small Flight Operations Team (FOT) to remain aware and responsive to the increased amount of ground system information in a multi-spacecraft environment...
Keywords: CARBON NANOTUBES; MECHANICAL PROPERTIES; MOLECULAR DYNAMICS; ELECTRONIC STRUCTURE; PLASTIC DEFORMATION; TETRAHEDRONS; COMPUTERIZED SIMULATION; AXIAL STRAIN
Downloads: 76
[texts]Production of temperature uniformity in an electric furnace (Volume Bulletin of the Bureau of Standards, Vol. 10, 451-473 (1914) Scientific Paper 219 (S219))
Earlier methods of obtaining uniformity of temperature within electric furnaces were unsatisfactory inasmuch as the uniformity was only obtained at one particular temperature. In the author's method an iron tube is wound longitudinally with constantan strip which is heated electrically. The two halves of the strip winding are connected in parallel, the advantages of this method of winding being (1) that irregularities in the resistance of the heating strip are distributed in such a way as to pro...
Keywords: electric furnaces; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 112
[texts]The reflecting power of various metals (Volume Bulletin of the Bureau of Standards, Vol. 7, 197-225 (1911) Scientific Paper 152 (S152)) - Coblentz, W.W.

Keywords: light reflection; thermoelectricity; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 72
[texts]Electrical resistance and critical ranges of pure iron (Volume Bulletin of the Bureau of Standards, Vol. 11, 457-470 (1915) Scientific Paper 236 (S236))
The resistances of an iron wire and a Pt-wire, wound on the same support and enclosed /b in vacuo/ in quartz glass, were compared at very short intervals of time during heating and cooling. Six iron thermometers were used from three samples, and all gave the same characteristics for pure iron. The resistance of iron increases from 0 degrees C. Without anomalies and with a gradually increasing temperature-coefficient until the neighbourhood of A1 is reached, As A2 is approached the resistance ris...
Keywords: electrical conductivity; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 108
[texts]General design of critically damped galvanometers (Volume Bulletin of the Bureau of Standards, Vol. 13, 211-244 (1916) Scientific Paper 273 (S273))
This paper discusses the relations between (1) the operation constants, namely, the external critical resistance, the deflection and ballistic periods, and the sensitivity in the particular conditions for use in which the galvanometer is intended, and (2) the intrinsic constants, namely, the inertia, damping, restoring, and displacing constants and the resistance, for critically damped galvanometers...
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 136
[texts]Sensitivity and magnetic shielding tests of a Thomson galvanometer for use in radiometry (Volume Bulletin of the Bureau of Standards, Vol. 13, 423-446 (1916) Scientific Paper 282 (S282))
Describes an investigation of the once exerted by various galvanometer coils as compared with a set of three coils used as standards. Some of the coils were wound according to theoretical requirements, while others were wound empirically. The behaviour of any coil under test was determined by observing the deflection produced by a given current as compared with the deflection produced by the same current when passed through the standard coils...
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 91
[texts]Methods of measuring the inductances of low-resistance standards (Volume Bulletin of the Bureau of Standards, Vol. 12, 11-21 (1915) Scientific Paper 246 (S246))
Values hitherto obtained for the residual inductance of "non-inductive" standards of low resistance have been based upon the calculated inductance of some conductor. The inductances of standards of odd shapes have been obtained by measuring the differences between their phase angle and that of the calculated standard. The methods described by the authors determine the phase angles of low-resistance standards without recourse to computed values...
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 105
[texts]Summary of experiments on the silver voltameter at the Bureau of Standards and proposed specifications (Volume Bulletin of the Bureau of Standards, Vol. 13, 479-514 (1916) Scientific Paper 285 (S285))
A summary of the experiments made on the silver voltameter at the Bureau of Standards, together with a very brief account of recent work done elsewhere. In 1911 at the Russian Bureau at Petrograd experiments by M. Foehringer with the Smith voltameter resulted in the value 1.01830 int. volts at 20 degrees C. being assigned to the Weston normal cell. In 1916, Obata at To macr kyo macr , using the Smith voltameter, obtained the value 1.01827 int...
Keywords: electrolysis; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 113
[texts]Resistance coils for alternating current work (Volume Bulletin of the Bureau of Standards, Vol. 8, 495-517 (1912) Scientific Paper 177 (S177)) - Curtis, H.L.; Grover, F.W.
A theoretical discussion is given to show the conditions which must be fulfilled in the construction of resistance coils in order that the phase angle shall be small and the change of resistance with frequency negligible. These principles are applied to the design of coils of different values, and specifications are given for the construction of coils of different denominations from 0.1 to 10,000 ohms.
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 137
[texts]The silver voltameter - Part IV. Third series of quantitative experiments and special investigations (Volume Bulletin of the Bureau of Standards, Vol. 10, 475-536 (1914) Scientific Paper 220 (S220))
A series of experiments has been carried out with the primary object of obtaining complete data to formulate specifications, according to which the voltameter might be used at any time for the measurement of current and (with the aid of resistance standards) for checking the constancy of the Weston normal cell. The voltameters used were the porous cup and Smith form, which were found to be in substantial agreement and give the value 1.01827 int...
Keywords: electrolysis; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 114
[texts]Adjustments of the Thomson bridge in the measurement of very low resistances (Volume Bulletin of the Bureau of Standards, Vol. 11, 65-68 (1914) Scientific Paper 225 (S225)) - Wenner, Frank; Weibel, Ernest
Describes convenient methods for adjusting the Thomson bridge when very low resistances are measured. The adjustments are made without the repeated opening and closing of the low-resistance connection between the two low-resistance arms.
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 135
[texts]A variable self and mutual inductor (Volume Bulletin of the Bureau of Standards, Vol. 13, 569-580 (1917) Scientific Paper 290 (S290))
The authors suggest the use of the name "inductor" for apparatus used to introduce "inductance" into a circuit, as well as "resistor" for apparatus possessing the property of "resistance." The paper describes the method of evolution and construction of an inductor having a range of variation of about 1 millihenry and a current-carrying capacity of about 5 amps. The form of apparatus considered to be most suitable is that consisting of two circular plates of ebonite, the lower plate containing tw...
Keywords: apparatus and instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 130
[texts]Theoretical and experimental study of the vibration galvanometer (Volume Bulletin of the Bureau of Standards, Vol. 6, 347-378 (1910) Scientific Paper 134 (S134))
The importance of the e.m.f. developed by the relative motion of the magnet and the winding of the galvanometer is pointed out and the general theory of the instrument is developed. The fundamental equation is stated and a solution is obtained giving the various working constants in terms of the intrinsic constants. The advantage of using a transformer with an instrument developing a relatively large back e.m.f...
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 204
[texts]Molecules Without Chemical Bonds - I.S. Dmitriev
In recent technical literature more and more of often one comes across such terms as "topology of a molecule", " topological properties", "topological bonding", etc. Broadly speaking, topology is a branch of mathematics dealing with the phenomenon of continuity. A more detailed definition would require from the reader a more profound knowledge of many complex mathematical concepts. This book, however, is designed primarily for a chemist...
Keywords: chemistry; topology; molecules; geometry; electronic structure; chemical topology; Polyene Ribbons; inorganic
Downloads: 473
[texts]A 5,000-volt generator set (Volume Bulletin of the Bureau of Standards, Vol. 1, 449-451 (1905) Scientific Paper 25 (S25)) - Nutting, P.G.
The small 500-volt Crocker-Wheeler bipolar dynamos, capable of giving 0.22 amp. as a maximum, are belt-driven by a 2-h.p. motor, the armatures being connected in series, thus giving 5,000 volts, and the fields in parallel, the latter being excited from a separate circuit. By means of a speed controller the voltage may be held constant, between 3,000 and 5,000 volts, to within 1 per cent. For gas-conductivity work requiring about 1 milliamp...
Keywords: apparatus and instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 208
[texts]Calculation of the maximum force between two coaxial circular currents (Volume Bulletin of the Bureau of Standards, Vol. 12, 317-373 (1916) Scientific Paper 255 (S255)) - Grover, Frederick W.
This paper comprises a complete statement of previous formulae and includes the development of a more direct solution of the case where two parallel, coaxial, circular ceils are placed at such a distance that their mutual attraction or repulsion is a maximum. Methods for the application of the formulae, worked-out examples, and tables to facilitate calculation are given. The paper does not permit of a more detailed abstract.
Keywords: electricity and magnetism; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 176
[texts]Construction of primary mercurial resistance standards (Volume Bulletin of the Bureau of Standards, Vol. 12, 375-464 (1916) Scientific Paper 256 (S256))
Describes the construction of 4 mercury units of resistance at the Bureau of Standards, Washington. A number of tubes of Jena glass were procured and 4 others of "Verre dur," but the latter have not yet been used, although their calibre factors are somewhat less than those of the Jena tubes. The respective lengths, calibre factors, and masses of mercury contained by the tubes at 0 degrees 3C are as follows:- Table no...
Keywords: electrical conductivity; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 178
[texts]The absolute measurement of inductance (Volume Bulletin of the Bureau of Standards, Vol. 1, 125-152 (1905) Scientific Paper 9 (S9))
The most obvious method of directly determining the inductance of a coil is that originally proposed by Joubert, and consists in first determining the impedance of the coil and then finding the ohmic resistance of the wire and the frequency of the current employed. In a variation of this method, described by Gray, a non-inductive resistance is placed in series with the coil whose inductance is to be measured, and an alternating current passed through both...
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 213
[texts]A new method for the absolute measurement of resistance (Volume Bulletin of the Bureau of Standards, Vol. 5, 499-509 (1909) Scientific Paper 111 (S111))
A new method is suggested for the absolute measurement of resistance. A revolving coil, or 2 such coils, are to be so disposed in the magnetic field of a pair of fixed coils as to yield an e.m.f. which can be compared, by means of a differential galvanometer, with the fall of potential through a fixed resistance, and so give the absolute value of the resistance. The advantage of this method would be that the e.m.f...
Keywords: measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 129
[texts]General College Chemistry - Charles W. Keenan & Jesse H. Wood
Charles W. Keenan & Jesse H. Wood General College Chemistry ( 3rd.ed.) Harper & Row Inc. 1966 Acrobat 7 Pdf 30.7 Mb. Scanned by artmisa using Canon DR2580C + flatbed option
Keywords: Chemistry; Atomic Structure; Electronic Structure; Chemical Bonds; Compounds; Kinetic Theory; Thermochemistry; Nuclear Reactions; Hydrocarbons
Downloads: 1,623
[texts]A brief review of recent superconductivity research at NIST (Volume 94) - Lundy, D.R.
Journal of Research of the National Institute of Standards and Technology
Keywords: overview; ceramics; copper oxides; electronic structure; crystal structure; materials science; perovskites; measurement science
Downloads: 135
[texts]Formation of stable electronic configurations of some physical properties of transition metal carbides and nitrides in the range of their homogeneity - Kuchma, A. YA.
Resistance change, thermoelectric force, and superconductivity data for transition metal carbides and nitrides
Keywords: ATOMIC STRUCTURE; TRANSITION METALS; ELECTRONIC STRUCTURE; SUPERCONDUCTIVITY; THERMODYNAMICS; TRANSITION ELEMENT; CARBIDES; HOMOGENEITY; METAL NITRIDES; NITRIDES; STABILITY; SUPERCONDUCTIVITY; THERMODYNAMICS; THERMOELECTRICITY
Downloads: 39
[texts]Simultaneous measurement of the capacity and power factor of condensers (Volume Bulletin of the Bureau of Standards, Vol. 3, 371-431 (1907) Scientific Paper 64 (S64))
Four bridge methods (one of them due to Wien) for obtaining simultaneously the ratio of two capacities and the difference of their power-factors are described. Various sources of error and the requisite methods for eliminating them are discussed. By the use of an auxiliary condenser, two condensers may be compared by substitution. This procedure has the advantage that electrostatic effects are eliminated, and only the relative values of the resistances and inductances of the bridge arms need to ...
Keywords: capacitance; dielectric materials; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 81
[texts]Compensated two-circuit electrodynamometer (Volume Bulletin of the Bureau of Standards, Vol. 3, 43-58 (1907) Scientific Paper 48 (S48))
This paper gives the theory and description of some two-circuit electrodynamometers, with standarised shunts, built at the Bureau of Standards and used for measuring alternating currents. When the instruments are compensated for the resultant inductance and capacity of the moving-coil circuit, they have the same constant for alternating current as for direct, and may therefore be calibrated by direct currents...
Keywords: alternating-current research; apparatus and instruments; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 134
[texts]The variation of resistances with atmospheric humidity (Volume Bulletin of the Bureau of Standards, Vol. 4, 121-140 (1907) Scientific Paper 73 (S73))
The authors criticise the statement made by Jaeger and Lindeck, that the variation of manganin resistances with atmospheric humidity need cause no anxiety to the owners of such resistances. In a particular case at the Bureau of Standards the variation of resistance of a standard coil between Jan, 1 and May 1, 1907, was about 85 parts in 100,000, the change occurring in the course of two weeks of damp weather, with the humidity averaging 64 per cent...
Keywords: apparatus and instruments; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 70
[texts]Clark and Weston standard cells (Volume Bulletin of the Bureau of Standards, Vol. 4, 1-80 (1907) Scientific Paper 70 (S70))
The authors give a brief history of Clark and Weston cells and a description of the methods employed at the Bureau of Standards for setting up such cells. A section dealing with the comparing baths, thermo-regulator,
Keywords: measurement standards; cells (electric); Condensed matter; electronic structure, electrical, magnetic, and optical properties A0620H Measurement standards and calibration
Downloads: 69
[texts]A new form of standard resistance (Volume Bulletin of the Bureau of Standards, Vol. 5, 413-434 (1909) Scientific Paper 107 (S107))
Rosa and Babcock have shown that resistance coils kept in an atmosphere of constant humidity are practically constant in resistance. The coil now described is wound in the usual manner on a brass cylinder 3 cm. in diam. and 7 cm. long, and is contained within a cylinder 4 cm. in diam. and 12.5 cm. high. The coil is shellacked, dried, and annealed in the usual manner. It is supported by a small tube closed at the bottom, which serves as a thermometer tube...
Keywords: apparatus and instruments; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 58
[texts]Experimental Evaluation of a Subscale Gaseous Hydrogen/Gaseous Oxygen Coaxial Rocket Injector - Smith, Timothy D.
The next generation reusable launch vehicle may utilize a Full-Flow Stage Combustion (FFSC) rocket engine cycle. One of the key technologies required is the development of an injector that uses gaseous oxygen and gaseous hydrogen as propellants. Gas-gas propellant injection provides an engine with increased stability margin over a range of throttle set points. This paper summarizes an injector design and testing effort that evaluated a coaxial rocket injector for use with gaseous oxygen and gase...
Keywords: NUMERICAL ANALYSIS; ELECTRONIC STRUCTURE; MOLECULES; STABILITY; DYNAMIC MODELS; RARE GAS COMPOUNDS; WAVE FUNCTIONS; ATOMS; BENDING; DECOMPOSITION; DISSOCIATION
Downloads: 108
[texts]Wheatstone bridges and some accessory apparatus for resistance thermometry (Volume Bulletin of the Bureau of Standards, Vol. 13, 547-561 (1917) Scientific Paper 288 (S288))
Bridges specially adapted for thermometry work are described. Instead of the usual slide wire the smaller steps are obtained by the use of shunts. The scheme of connections of the bridge is shown in the Fig. The two ratio coils are 250 ohms each and are connected by a short wire which is used in adjusting them to equality. The other ends of the coils terminate in long bars which may be connected by means of plugs to the contact blocks of the 1-ohm and 0.1-ohm decades...
Keywords: measurements and use of instruments; thermometry, pyrometry and calorimetry; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 119
[movies]MIT 5.112 Principles of Chemical Science, Fall 2005 - MIT OpenCourseWare
5.112 is an introductory chemistry course for students with an unusually strong background in chemistry. Knowledge of calculus equivalent to 18.01 is recommended. Emphasis is on basic principles of atomic and molecular electronic structure, thermodynamics, acid-base and redox equilibria, chemical kinetics, and catalysis. The course also covers applications of basic principles to problems in metal coordination chemistry, organic chemistry, and biological chemistry.
Keywords: introductory chemistry, atomic structure, molecular electronic structure, thermodynamics, acid-base equilibrium, redox, chemical kinetics, catalysis, lewis structures, VSEPR theory
Downloads: 27,591
[movies]MIT 5.111 Principles of Chemical Science, Fall 2005 - MIT OpenCourseWare
5.111 is an introductory chemistry course, emphasizing basic principles of atomic and molecular electronic structure, thermodynamics, acid-base and redox equilibria, chemical kinetics, and catalysis. This course also introduces the chemistry of biological, inorganic, and organic molecules.
Keywords: introductory chemistry, atomic structure, molecular electronic structure, thermodynamics, redox, chemical kinetics, catalysis, lewis structures, VSEPR theory, acid-base equilibrium
Downloads: 13,938
[movies]MIT 3.091 Introduction to Solid State Chemistry, Fall 2004 - MIT OpenCourseWare
This course explores the basic principles of chemistry and their application to engineering systems. It deals with the relationship between electronic structure, chemical bonding, and atomic order. It also investigates the characterization of atomic arrangements in crystalline and amorphous solids: metals, ceramics, semiconductors, and polymers (including proteins). Topics covered include organic chemistry, solution chemistry, acid-base equilibria, electrochemistry, biochemistry, chemical kineti...
Keywords: solid state chemistry, electronic structure, chemical bonding, crystal structure, atomic and molecular arrangements, crystalline and amorphous solids
Downloads: 27,592
[texts]A study of electromagnet moving-coil galvanometers for use in alternating-current measurements (Volume Bulletin of the Bureau of Standards, Vol. 14, 23-58 (1918) Scientific Paper 297 (S297))
A description of electromagnet moving-coil galvanometers for measurements on alternating currents and a presentation of the theory of their action. From the equations of motion of a coil carrying an alternating current in an alternating magnetic field it is shown that the deflection thetas = GE cos [ beta /(RU)], where G is the rate of change with the deflection of the effective value of the flux, E the effective value of the impressed e.m.f., beta the angle of lead of the impressed e.m.f...
Keywords: apparatus and instruments; measurements and use of instruments; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 238
[texts]The four-terminal conductor and the Thomson bridge (Volume Bulletin of the Bureau of Standards, Vol. 8, 559-610 (1912) Scientific Paper 181 (S181)) - Wenner, Frank
In low-resistance standards capable of carrying large currents, the surfaces of the contacts through which the current enters and leaves must be large. In many cases the resistance depends, to some extent, on the manner in which the current leads are attached. In alternating-current measurements it is also necessary to know the inductance. The present paper points out the conditions which must be fulfilled in order that the resistance may be definite, or both the resistance and inductance be def...
Keywords: measurements and use of instruments; electricity and magnetism; Condensed matter; electronic structure, electrical, magnetic, and optical properties
Downloads: 206
[texts]Thermographic Analysis of Composite Cobonds on the X-33 - Russell, Samuel S.
During the manufacture of the X-33 liquid hydrogen (LH2) Tank 2, a total of thirty-six reinforcing caps were inspected thermographically. The cured reinforcing sheets of graphite/epoxy were bonded to the tank using a wet cobond process with vacuum bagging and low temperature curing. A foam filler material wedge separated the reinforcing caps from the outer skin of the tank. Manufacturing difficulties caused by a combination of the size of the reinforcing caps and their complex geometry lead to a...
Keywords: NONLINEARITY; WURTZITE; ELECTRONIC STRUCTURE; POISSON EQUATION; SCHROEDINGER EQUATION; NONLINEAR OPTICS; ELECTRO-OPTICAL EFFECT; RECTIFICATION; HARMONIC GENERATIONS; PIEZOELECTRICITY; GALLIUM NITRIDES; ALUMINUM NITRIDES; QUANTUM WELLS
Downloads: 78
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